Liquozone was an early 1900s health craze, marketed as a water-based product infused with “free oxygen” through ozonization. The company claimed this enhanced form of oxygen could kill germs and treat a wide variety of diseases. It was often promoted as safe, natural, and scientifically advanced. These claims were ultimately debunked, and the product became a textbook example of patent medicine fraud. Government scrutiny and changing laws around medical advertising led to its eventual downfall. 

Liquozone emerged during a period of minimal regulation and maximum marketing optimism. Marketed as a scientific miracle containing “free oxygen” through ozonization, it was heavily promoted as a safe, natural germicide that could cure everything from consumption to catarrh.

In 1905, muckraking journalist Samuel Hopkins Adams published a scathing exposé in Collier’s Weekly, later collected as The Great American Fraud. In Chapter 3, he devoted an entire essay to Liquozone, calling it:

“…a notable swindle, selling under false pretenses and by means of deliberately fraudulent advertising a product of practically no therapeutic value.”

Adams’ work helped usher in the Pure Food and Drug Act of 1906, which would change how such products were labeled, sold, and scrutinized. Liquozone became a symbol of the unchecked claims and consumer exploitation that characterized the patent medicine era.